LABEO. 177 



crescentic when fully spread out. Caudal peduncle once and one-fourth to once 

 and a half as long as deep. Scales finely striated longitudinally, more or less rugose 

 with granules in the centre, 38-42 ftp, 4-5 between the lateral line and the ventral, 

 16 (rarely 18) round the caudal peduncle. 



Females, which appear to be much scarcer than males, differ in the lesser 

 development of the horny tubercles on the snout and in the shorter anterior rays of 

 the dorsal and anal fins, as may be seen by reference to the table of measurements 

 here given, specimens of the same total length being compared in columns 4 ( s ) and 

 5 ( $ ), and 7 ( <S ) and 8 ( 2 ). 



A coloured sketch made at Assuan by Mr. Loat represents the fish as dark olive 

 above and on the sides, white beneath ; the scales on the sides pink in the centre ; the 

 fins dark grey. The first ray of the pectoral, ventral, and anal fins often yellowish. 

 The largest specimen examined by me measures 360 millimetres. 

 Out of one hundred and six specimens examined, only four (two from Cairo and 

 two from Didessa R.) have 9 branched rays in the dorsal, and two (Luxor and 

 Didessa E.) have 11. 38 scales in the lateral line occurs eleven times, 39 scales 

 twenty-four times, 40 scales thirty times, 41 scales thirty-seven times, and 42 scales 

 four times. 



The following material has been at my disposal : — 



4 Lower Nile.— S. S. Allen, 1862. 



9 Nile near Samannud. — Loat, 12-14.7.99. 



4 Rosetta branch o£ Nile, downstream side of Barrage. — Loat, 28-29.7.99. 

 3 Nile near Cairo (bought in fish-bazar). — Loat, 3.99. 



1 Wasta.— Loat, 28.8.99. 



18 At regulators near Luxor. — Loat, 10-11.99. 



2 Assuan. — Loat, 3.1.00. 



5 Korosko, Nubia.— Loat, 26.1.00. 

 36 Wady Haifa.— Loat, 21-22.2.00. 



2 Kosheh, Nubia.— Loat, 26.3.00. 



1 District of Third Cataract, a few miles north of Hannek. — Loat, 22.4.00. 



1 Khartum.— Petherick, 1862. 



1 Wad Medine, Blue Nile.— Loat, 5.10.01. 



1 Sennar, Blue Nile.— Loat, 22.10.01. 



115 Rosaires, Blue Nile.— Loat, 28.10.01-1.11.01. 



12 Didessa R., Gruma, 1500 m. — Zaphiro, 10.5.05. : 



4 Juju R., affluent of Didessa B., Gruma, 2000 m. — Zaphiro, 5.5.05. 



Labeo forskalii is, at present, only known from the Nile proper and the Blue Nile 

 and its upper tributaries. The various references to it from the Victoria Nyanza and 

 various parts of East Africa are based, so far as I have been able to ascertain, on forms 

 such as L. victorianus, Blgr., L. cylindricus, Peters, and L. Mrkii, Blgr., which, though 



2a 



